Tanker endorsement (N)

What counts as a tank vehicle

Federal rules define a tank vehicle as a commercial motor vehicle designed to carry any liquid or gaseous materials in a tank or tanks with an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1,000 gallons or more, permanently or temporarily attached (49 CFR 383.5). An empty storage tank, not designed for transport, temporarily attached to a flatbed isn't a tank vehicle.

Source: 49 CFR 383.5 and 383.93, eCFR · checked 2026-10

Single 5,000 gal tank trailer

Yes: N

Two 100 gal totes

No (each 119 gal or less)

Ten 330 gal IBC totes, 3,300 gal

Check: may meet the definition

Fuel tanker with placarded fuel

X (N + H)

Water truck, 2,000 gal

Yes: N

EXAMPLE setups. The definition depends on rated capacity, not how full the tanks are.

Getting the endorsement

The N endorsement requires a knowledge test at your state licensing agency (49 CFR 383.93). Unlike H, it doesn't require a TSA background check unless you're adding hazmat. To haul hazardous materials in a tank, you need both, which your state shows as X; see the hazmat endorsement guide.

In practice

Tank work includes fuel, chemicals, food-grade liquids, milk and water. Liquid loads surge, so tanker driving takes extra care in braking and curves, which the knowledge test covers. Many tank jobs also need H, a clean record and carrier-specific training. Check your license class first with the CDL checker or CDL classes.

Do I need a tanker endorsement for IBC totes?

It depends on capacity: each tank over 119 gallons and 1,000 gallons or more in total meets the federal definition, whether totes are permanently or temporarily attached. Check the rated capacity of what you haul.

Is X the same as having N and H?

Yes. X is the code for the combined tank vehicle and hazardous materials endorsements (49 CFR 383.153).